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siostry:
x * 2x = 2x
x = 2
bracia:
2 * 2 = 4
Agata ma 2 siostry i 4 braci
Paweł
2 + 1 = 3
4 - 1 = 3
Paweł ma 3 siostry i 3 braci
Razem:
3 + 4 = 7
Odp. W tej rodzinie jest 7 dzieci.